[Ovmsdev] Can buses stop after some time

[Mark Webb-Johnson]

Tom,

Err flags 0x2040. The 0x20 part is the error interrupt. The 0x40 part is "RX0OVR: Receive Buffer 0 Overflow Flag bit”.

Where the number on ‘can can2 status’ moving at all? Or completely stuck?

Seems different than the fault Greg and I are seeing. This one likely to be interrupt flag, or buffer overflow, not being cleared correctly. I’m guessing the overflow because that just doesn’t seem correct in mcp2515::RxCallback(). I’ll focus on that and have a look.

Regards, Mark.

> On 6 Jul 2018, at 5:51 PM, Tom Parker <tom at carrott.org> wrote:
> 
> My situation is somewhat different. Can2 is sick, but Rx err is 0:
> 
> OVMS# can can2 status
> CAN:       can2
> Mode:      Active
> Speed:     500000
> Interrupts:             6945528
> Rx pkt:                 7012397
> Rx err:                       0
> Rx ovrflw:                 2483
> Tx pkt:                    6801
> Tx delays:                    0
> Tx err:                       0
> Tx ovrflw:                    0
> Err flags: 0x2040
> 
> If I power cycle the can bus then things start to work again.
> 
> OVMS# power   can2 off
> Power mode of can2 is now off
> OVMS# can can2 start active 500000
> Can bus can2 started in mode active at speed 500000bps
> OVMS# can can2 status
> CAN:       can2
> Mode:      Active
> Speed:     500000
> Interrupts:               10263
> Rx pkt:                   10340
> Rx err:                       0
> Rx ovrflw:                    6
> Tx pkt:                       0
> Tx delays:                    0
> Tx err:                       0
> Tx ovrflw:                    0
> Err flags: 0x2040
> 
> My experience is that can2 only lasts a few minutes to perhaps an hour of driving before stopping. I'll see what it looks like next time it stops.
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